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Singleton
A singleton is a class for which only one instance
can exist within a program. It enforces at most
one instance of some class and controlled access
to it.
Implementation of a singleton class is as follows:
| public class
SingletonClass { |
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private static final SingletonClass instance
= new SingletonClass();
private SingletonClass(){} //Default constructor
is private
public static SingletonClass getInstance(){
return instance;
}
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| }//
End of class |
The Java spec guarantees that the static initializer
will be executed only once, at class load time.
OR
| public class
SingletonClass { |
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/**
* The constructor could be made private
* to prevent others from instantiating this
class.
* But this would also make it impossible
to
* create instances of Singleton subclasses.
*/
protected SingletonClass(){}
static private instance = new SingletonClass();
public static SingletonClass getInstance(){
return instance;
} |
| }//
End of class |
For further reference refer Singleton
Pattern in Java Design Patterns.
[
Received from Seeny Desai ]
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